Warm tips: fan work in the air is easy to adhere to the dust, cleaning need to cut off the power supply for cleaning. Industrial exhaust fan: mainly used for forced air convection. Electric fans are used for a long time, the fan blade is easy to get a lot of dust underneath. This is due to the electric fan at work, due to fan blade and air friction, fan blade with static electricity, charged objects can attract small light objects, which can adsorb tiny dust floating in the room.